servicequeue.php

<?php
 
namespace Bitrix\Seo\BusinessSuite\Utils;
 
use Bitrix\Seo\BusinessSuite\Internals;
 
final class ServiceQueue
{
    private static $instancePool = [];
 
    private $head;
 
    private $values;
 
    public static function getInstance(string $type) : self
    {
        if(!array_key_exists($type,static::$instancePool))
        {
            static::$instancePool[$type] = new static($type);
        }
        return static::$instancePool[$type];
    }
 
    private function __construct(string $type)
    {
        $this->values = Internals\ServiceQueueTable::getList([
            'select' => ['ID','SERVICE_TYPE','CLIENT_ID','TYPE'],
            'filter' => ['=TYPE'=> $type ],
            'order' => ['SORT' => 'DESC']
        ]);
        $this->head = $this->getHead();
    }
    private function __clone()
    {}
 
    public function getHead()
    {
        return $this->head = ($this->head? $this->head : $this->values->fetch());
    }
 
    public function removeHead()
    {
        if($this->head)
        {
            Internals\ServiceQueueTable::delete($this->head['ID']);
            unset($this->head);
        }
    }
}